Steam-radiator



G. W. BLAKE. -'Ste am-Radiator. No. 224,131; Patented Feb. 3,1880.

iirir imam vii -lifillii---- B A V N.FETERS. PHDTO-LITHOGRAPHER. WASHINGTON. D C.

UNITED STATES GEORGE W. BLAKE, OF 'NEWYORK,

N. Y, ASSTGNOR T JOHN T. KELLY AND'GEORGE M. JONES, OF PITTSBURG, PENNSYLVANIA.

STEAM-RADIATOR. v

SPECIFICATION forming part of Letters Patent No. 224,131, dated February 3, 1 880.

Application filed July 11', 187;

To all whom it maiy concern Be it'known that I, GEORGE W. BLAKE, of the city and State of New York, have invented a new and useful Improvement in Steam-Radiators; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being bad to the accompanying drawing, forming part of this specification.

This invention relates to that class of steamradiators in which interior circulation-tubes are employed. Such tubes have heretofore been made of ordinary gas-tubing, and have had screw-threads cut on one end to screwinto tapped holes provided for their reception in the base or trunk 'of the radiator.

The object of my invention is to reduce the cost of these tubes; and to this end it consists in making them of sheet metal by rolling up strips of such metal into tubular form without uniting the edges, and driving the tubes thus formed into holes provided for them in the base or trunk, thus not only greatly reducing the first cost of the tubes theinselves, but avoidin g the expense of cutting screws on them and of tapping the holes provided in the base or trunk for their reception.

A is the base or trunk. B B are the radiating-tubes, and O G are the circulation-tubes.

The circulating-tubes are made of ordinary sheetiron, which may be of the cheapest kind, I and which, first, is cut into strips of a Width corresponding with the intended circumference of the tubes, and then rolled up trans- .versel y into tubular form, the edges being just brought together. The tube thus formed, though made'much thinner and having a longitudinal slit or opening-seam, a, is as good for the purpose as a'welded tube, as itis subject' to uniform piessure within and without, 40

and any slight leak through the slit a left between the abutting longitudinal edges of the piece of metal of which the tube is made is unim portant. The holes I) b,provided in the base,

for the reception of these tubes are simply '5 drilled and-the tubes are driven in very tight.

The tubes may be a trifleilarger than the holes before entering, especially as the edgesof their slits or open seams will generally be left somewhat roughin the cutting of the strips of which they are made, so that a slight contraction of I the circumference by the bringing of the edges closer together may take place in the act of driving, and the slight elasticity of the metal will cause the tubes to press outward against the holes and. keep themselves tight'and firm in their places.

To facilitate the entry of the tubes in driving they maybe slightly beveled oif at the edges of the end which enters the hole; or

the can". of the tubes may be facilitated by very slightlycountersinking or tapering the mouth of the hole.

Tubes thus made and applied to a radiator cost about one-sixthas much as ,welded tubes screwed into tapped holes.

I claim' The circulation-tubes G, made with a longitudinalslit or open seam, in combination with the radiator base or trunk A, provided with holes I) 1), into which the said tubes are driven and by-which they are supported independently of the outer tubes, substantially as here 

